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QUA22_D80
10-19-2010, 10:45
Post: #1
QUA22_D80
Hi,
i want just ask if QUA22_D80 parameter in default.sky refer to 22.5 degrees of elevation or to zenithal distance.
Thank you for help.
Reagards
Marianna
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12-08-2010, 14:50 (This post was last modified: 12-08-2010 14:51 by Emmanuel Bertin.)
Post: #2
RE: QUA22_D80
Hi Marianna,

my answer problably comes a bit late, sorry Sad ; QUA22_D80 has nothing to do with zenithal distance or elevation, it refers to the aberration coefficient of the quadrifoil (or quatrefoil) quasi-Zernike polynomial component with 22.5 deg orientation Z(-4;4). The D80 refers to the angular diameter of the disk that encloses 80% of the total spot light when only this specific component is considered.
- Emmanuel.
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